/*
 * FileSaver.js
 * A saveAs() FileSaver implementation.
 *
 * By Eli Grey, http://eligrey.com
 *
 * License : https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md (MIT)
 * source  : http://purl.eligrey.com/github/FileSaver.js
 */

// The one and only way of getting global scope in all environments
// https://stackoverflow.com/q/3277182/1008999
var _global: any =
    typeof window === "object" && window.window === window
        ? window
        : typeof self === "object" && self.self === self
        ? self
        : typeof global === "object" && global.global === global
        ? global
        : this

function bom(blob: any, opts: any) {
    if (typeof opts === "undefined") opts = { autoBom: false }
    else if (typeof opts !== "object") {
        console.warn("Deprecated: Expected third argument to be a object")
        opts = { autoBom: !opts }
    }

    // prepend BOM for UTF-8 XML and text/* types (including HTML)
    // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
    if (opts.autoBom && /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
        return new Blob([String.fromCharCode(0xfeff), blob], { type: blob.type })
    }
    return blob
}

function download(url: any, name: any, opts: any) {
    var xhr = new XMLHttpRequest()
    xhr.open("GET", url)
    xhr.responseType = "blob"
    xhr.onload = function () {
        saveAs(xhr.response, name, opts)
    }
    xhr.onerror = function () {
        console.error("could not download file")
    }
    xhr.send()
}

function corsEnabled(url: any) {
    var xhr = new XMLHttpRequest()
    // use sync to avoid popup blocker
    xhr.open("HEAD", url, false)
    try {
        xhr.send()
    } catch (e) {}
    return xhr.status >= 200 && xhr.status <= 299
}

// `a.click()` doesn't work for all browsers (#465)
function click(node: any, tmp2?: any) {
    try {
        node.dispatchEvent(new MouseEvent("click"))
    } catch (e) {
        var evt = document.createEvent("MouseEvents")
        evt.initMouseEvent("click", true, true, window, 0, 0, 0, 80, 20, false, false, false, false, 0, null)
        node.dispatchEvent(evt)
    }
}

// Detect WebView inside a native macOS app by ruling out all browsers
// We just need to check for 'Safari' because all other browsers (besides Firefox) include that too
// https://www.whatismybrowser.com/guides/the-latest-user-agent/macos
var isMacOSWebView =
    _global!.navigator &&
    /Macintosh/.test(navigator.userAgent) &&
    /AppleWebKit/.test(navigator.userAgent) &&
    !/Safari/.test(navigator.userAgent)

var saveAs =
    _global!.saveAs ||
    // probably in some web worker
    (typeof window !== "object" || window !== _global
        ? function saveAs() {
              /* noop */
          }
        : // Use download attribute first if possible (#193 Lumia mobile) unless this is a macOS WebView
        "download" in HTMLAnchorElement.prototype && !isMacOSWebView
        ? function saveAs(blob: any, name: any, opts: any) {
              var URL = _global.URL || _global.webkitURL
              var a = document.createElement("a")
              name = name || blob.name || "download"

              a.download = name
              a.rel = "noopener" // tabnabbing

              // TODO: detect chrome extensions & packaged apps
              // a.target = '_blank'

              if (typeof blob === "string") {
                  // Support regular links
                  a.href = blob
                  if (a.origin !== location.origin) {
                      corsEnabled(a.href) ? download(blob, name, opts) : click(a, (a.target = "_blank"))
                  } else {
                      click(a)
                  }
              } else {
                  // Support blobs
                  a.href = URL.createObjectURL(blob)
                  setTimeout(function () {
                      URL.revokeObjectURL(a.href)
                  }, 4e4) // 40s
                  setTimeout(function () {
                      click(a)
                  }, 0)
              }
          }
        : // Use msSaveOrOpenBlob as a second approach
        "msSaveOrOpenBlob" in navigator
        ? function saveAs(blob: any, name: any, opts: any) {
              name = name || blob.name || "download"

              if (typeof blob === "string") {
                  if (corsEnabled(blob)) {
                      download(blob, name, opts)
                  } else {
                      var a = document.createElement("a")
                      a.href = blob
                      a.target = "_blank"
                      setTimeout(function () {
                          click(a)
                      })
                  }
              } else {
                //   navigator.msSaveOrOpenBlob(bom(blob, opts), name)
              }
          }
        : // Fallback to using FileReader and a popup
          function saveAs(blob: any, name: any, opts: any, popup: any) {
              // Open a popup immediately do go around popup blocker
              // Mostly only available on user interaction and the fileReader is async so...
              popup = popup || open("", "_blank")
              if (popup) {
                  popup.document.title = popup.document.body.innerText = "downloading..."
              }

              if (typeof blob === "string") return download(blob, name, opts)

              var force = blob.type === "application/octet-stream"
              var isSafari = /constructor/i.test(_global.HTMLElement) || _global.safari
              var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent)

              if ((isChromeIOS || (force && isSafari) || isMacOSWebView) && typeof FileReader !== "undefined") {
                  // Safari doesn't allow downloading of blob URLs
                  var reader = new FileReader()
                  reader.onloadend = function () {
                      var url: any = reader.result
                      url = isChromeIOS ? url : url.replace(/^data:[^;]*;/, "data:attachment/file;")
                      if (popup) popup.location.href = url
                      else location = url
                      popup = null // reverse-tabnabbing #460
                  }
                  reader.readAsDataURL(blob)
              } else {
                  var URL = _global.URL || _global.webkitURL
                  var url = URL.createObjectURL(blob)
                  if (popup) popup.location = url
                  else location.href = url
                  popup = null // reverse-tabnabbing #460
                  setTimeout(function () {
                      URL.revokeObjectURL(url)
                  }, 4e4) // 40s
              }
          })

_global.saveAs = saveAs.saveAs = saveAs

export let fileSaveAs: any = saveAs
